tty: xilinx_uartps: Check the clk_enable return value

Check the clk_enable return value.
If clocks are not enabled the register accesses could hang the
system so error out instead.
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Link: https://lore.kernel.org/r/20220729114748.18332-8-shubhrajyoti.datta@xilinx.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/xilinx_uartps.c

@@ -1420,9 +1420,17 @@ static int __maybe_unused cdns_runtime_resume(struct device *dev)
 {
 	struct uart_port *port = dev_get_drvdata(dev);
 	struct cdns_uart *cdns_uart = port->private_data;
+	int ret;
+
+	ret = clk_enable(cdns_uart->pclk);
+	if (ret)
+		return ret;
 
-	clk_enable(cdns_uart->pclk);
-	clk_enable(cdns_uart->uartclk);
+	ret = clk_enable(cdns_uart->uartclk);
+	if (ret) {
+		clk_disable(cdns_uart->pclk);
+		return ret;
+	}
 	return 0;
 };